Laminated ski



April 7, 1953 E. TRIBELHORN 2,634,136

LAMINATED sx1 Filed Feb. 2o, 1951 2 SHEETSh-SHEET l 4I?, SHEETS-SHEET 2 Do Ven far Em//e 77/'175//7/10/#7 /4 #vr/4 y E TRIBELHORN LAMINATED SKI ng. J

Filed Feb. 2o, 1951 Patented Apr. 7, 1953 lAppliisation February 20, 1951,1'Ser'ial` No.,'.211,917 lIn Switzerland August` A17, 1948 1"Claim.

'The present. invention .relates to a ski composed of 'several'layers Skis,.produced.of several. layers .have been :known iin. which. the .layers .consisted of various `mate als.jointed .together .by lbeing bonded .1ongtudinally. .Experience has, however, shown thatthe .skis of thetype .described .have the disadvantage that theyv become warped-more4 or less rapidly. -'Ihetendencyto warping` can .be traced to the .ffactthat .the variouslayers react differently to .thein'iiuences of weather to which the skis are subjected whenbeing stored as Well as whenf-beingused. In particular dampand-temvperature variations favour the warping Aby which the skis become unusable.

A.'Iofeliminate this disadvantage vit has been pro- ,posed Pto com-pose the 4skis vof three layers, the

.middle layer `of `which is grained transversely.

heuhope .for elimination of warping by this .measure was, however., not realized; on the contrary the wood `became even more warped and distortedandias .regards the elasticity-no worth while improvement .could be achieved. Y

.It has Inowbeen'found that by the use of a Lcombination of various. layers of material for the manufacture of .aski .practical results can only then beattained 'if the differences of the characteristics inherent in the variation of the layers, such as the differences with regard to moisture absorption, elasticity, resistance, proofness to breakage, heat conductivity, etc., are systematically deteifrnined fand taken into consideration. The extended tests carried out have shown that yfor the elimination` of distortion in the transverse direction, 'the top and bottom layer `must .consist of "exactly the same material, it being of A.advantage to make said two layers moisture .re-

pllent. -To achieve the necessary elasticity and the resilient lresistance of 4-thesk'i, at least one of the intermediate layers -must consist of Wood. Theski composed of variouslayers according to :the invention is characterized in that `both the top and the bottom layer consist of a heat invsulating material harder than wood, which :ma-

in 'a "single operation. At the same time `Vthe resilience 'of the ski can be determinedby the choiceof the pressure die used for the'be'ndin'g.

YBy Way'of example various embodiments ofthe object of the invention are shown inthe 'accompanying drawing in which:

Fig. l'is the ski in side elevation; c n

Fig. 2 is an enlarged diagrammatic detailed View of the rear lportion of the ski shown in Fig. 1 with the metal lining omitted; c v M Fig. 3 is a plan View of the gliding surface 'ofa ski with protective lining according to an'alternative; n c Y Fig. 4 a cross. section through the ski'ac'co'rding to Fig. 3 drawn to an enlarged scale;

Fig. 5 a Vside 'view of the ski according to la further example of embodiment;

Fig. 6 across section through the ski according to Fig. 5 drawn to an enlarged scale;

Fig. "7 a'pl'a'n View of the `ski according `to a fourth exampleof embodiment;

Fig. 8 'a cross section through theski according to Fig. 7 drawn'to an enlarged scale; K

Fig. 9a plan view of thegliding surface ofthe ski `according to the iifthfexample of embodiment, and

Fig. 10 a cross section'through the `ski according to Fig. 9 drawn to an enlarged scale.

The ski 'shown in Figs. 1 and `2 consists cfa number of layers of vvariousn'iaterials independently bonded together by gluing. The top and the bottom Alayers la and Ib are made of .amaterial that yis harder than wood and does not absorb moisture. lInlp'articular, plastics, such Aas synthetic resin mass', might come into consideration Vas such a-m'aterial. These plastics do not absorb any moisture andare exceedingly hard, thus at the 'same time strengthening the ski. With .advantage the top layer la is 'thinner than .the .bottom layer Ib in thellatter "of which a vguiding groove t iscOunterSu'nk. :For preference, the top layer might e. g. be of 1 nim. 'thickness and the bottom layer of 4 mm. thickness. To make the projecting point of the ski resilient and keep it from warping, the bottom layer Ib of 4 mm. thickness is made to taper out to 1 mm. thickness 4at the start of the curvature of the point.

To achieve the necessary elasticity and resilient resistance a central Wooden batten is provided beis much superior to that of a conventional ski of wood.

The ski is further reinforced by the outer layers of a chosen plastic material described which is moisture repellent and hasan exceptional degree of hardness. The inside layers disposed to absorb moisture are covered and insulated. Thus the ski is to a large extent immune against the inuence of the weather, such as cold, heat, moisture, etc.,

and does not warp. This all the more so as the bottom layer lb, having a thickness of 4 mm., at rthe same time acts as a stress equalizer of the two layers of wood.

The method for the manufacture of the skis described is carried out in dies provided with the curvature required. The various layers forming the ski are formed in corresponding dies in the dry condition after previously having been coated with glue. The dies are fashioned for the reception of sheets to be bonded together, said sheets being e. g. of the size of 2.20 m. x 1.20 m.,

from which sheets 12 skis (6 pairs) can be cut out by means of a circular saw. The ski blanks thus produced can immediately be treated further ,vvithout the usual dry storing of 2-3 months duration. Thus the usual steam drying plants are eliminated, By changing the shape of the die,

e. g. by its curvature being stiffer or atter by a few millimeters, the ski can be given a greater or smaller elasticity, since the shape given to it initially is retained permanently and unchangeably.

With the ski according to the example of embodiment shown in Figs. 3 and 4 the gliding surface is reinforced with a lining 5 of material resistant to wear and tear. This lining is with pref- Y erence applied by spraying on and by way of ex- ,ample consists of metal or plastics such as synthetic resin. By the lining 5 the gliding surface of ,the ski batten S is protected against wear and tear, and depending on the type of the lining, the gliding capacity of the ski is increased.

In the example of embodiment according to Figs. 5 and 6, the lining 5 does not only extend over the whole gliding surface of the ski, but also over the side parts thereof, so that the lining 5 at the same time serves as a protection of the edges.

In the example of embodiment last described the provision of special ski-edges is unnecessary and thus a weakening of the ski by the application of screw holes for securing the ski edges does not take place.

In the example of embodiment according to ,Figs 7 and 8 the ski batten S is provided completely with the lining 5 by which said batten is 4 fully protected against atmospheric influences, so that the warping of the ski is impossible. In this case the lining 5 can consist of two different materials; thus, e. g. the gliding surface with the side edges can have a lining of material resistant to wear and tear, whereas a lining of less resistant material can be applied to the top of the ski.

In the example of embodiment according to Figs. 9 and l0 only the two side edges and the parts of the gliding surface adjacent to them are provided with a lining 5 of a material resistant to wear.

An example of embodiment can also be visualized according to which the gliding surface of the ski is provided strip-fashion with linings of different materials. Thus side by side with a, strip of metal, one of plastic can be provided.

Furthermore another example of embodiment can be visualized in which the gliding surface of the ski is mainly provided with a lining of synthetic resin and only single, narrow, longitudinal strips are of metal.

As advantages of the ski described, mention can be made of the fact that they no longer need to be waxed, inasmuch as the layer serving as a gliding surface is very hard and acts as polished gliding surface; furthermore the fixing of metal edges becomes superiluous.

By the cold bonding and the dry bending, the ski is given a durable, unchangeable shape as well as a high elasticity and proofness against breakage.

The method described has the advantage of simplicity and economy.

What I claim is:

A laminated ski comprising a wooden core formed from two wooden plies, an upper layer and a lower layer of vulcanized fiber adhesively secured to each side of said core in the longitudinal direction of said ski, a layer` of plastic water repellent material adhesively secured to said upper layer, and a layer of said plastic water repellent material adhesively secured to said lower layer, and a continuous lining of sprayed metal completely enclosing the ski.

EMILE TRIBELHORN.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 1,993,636 Ullevoldsaetter Mar. 5, 1935 2,038,530 Anderson Apr. 28, 1936 2,184,791 Broome Dec. 26, 1939 2,213,903 Davidson Sept. 3, 1940 FOREIGN PATENTS Number Country Date 733,250 France July 4, 1932 173,442 Switzerland Feb. 16, 1935 83,305 Sweden Apr. 30, 1935 262,822 Switzerland Oct. 17, 1949 273,982 Switzerland June l, 1951 

